Power equipment for reversing-valves of locomotive-engines.



G. L. DUNBAR. POWER EQUIPMENT FOR REVERSING VALVES 0F LOOOMOTIVE ENGINES. APPLICATION FILED JUNE 4, 1914.

1,1 18,480. Patented Nov. 24, 1914.

3 SHEETS-SHEET 1.

THE NORRIS PETERS (10.. PHDMITHOU WASHINGTUN, D- C.

G. L. DUNBAR.

POWER EQUIPMENT FOR REVERSING VALVES 0F LOGOMOTIVE ENGINES.

APPLICATION mum JUNE 4, 191-1.

1,1 18,480. Patented Nov. 24, 1914.

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POWER EQUIPMENT FOR REVEBSING VALVES 0E LOGOMOTIVE ENGINES.

APPLIGATION FILED JUNE 4, 1914. 1,1 18,480. Patented Nov. 24, 1914.

3 SHEETSSHEET 3.

THE NURFJIS PETERS CO FH'IOTO LIIMCEv WASHINGTON, D L

UNITED STATES Familiar OFFICE CHARLES L. DUNBAR, or Lsnnivon, NEW HAMPSHIRE.

POWER. EQUIPMENT FOR REVEBS ING-VALVES 0F LOCOMOTIVE-ENGINES.

Specification of Letters Patent. Patented NOV. 24;, 1914.

Application .fiIed June 4, 1914. Serial No. 842,869.

To all whom it may concern l I t Be it. known that 1, CHARLES L. DUNBAR, a citizen of the United States, residing at 52 Elm street, Lebanon, county of Grafton, State of New Hampshire, have invented certain new and useful Improvements in Power Equipments for Reversing-Valves of Locomotive-Engines, fully described and represented in the following specification and the accompanying drawings, forming a part of the same.

This invention relates to an improved form of power equipment for reversing the valves of locomotive engines.

The invention employs an air or steamcylinder with piston connected to a bellcrank for operating the valve-reversing link,

and mechanism for controlling the operation of steam or air in such cylinder by means of a main-distrlbutlng-valve and an auxiliary control-valve which latter is moved by Figure 1 is an elevation of the reverselever and its attachments with part of the rods which connect will with the reversing gear; Fig. 2-is a sidevifewlot the same; ig.. 3a side view of the latches enlarged; Fig.

4 is a longitudinal section Tof the reversing:

cylinder and it's valve andpiston-conneetions in their central positiong Fig. 5 is, a similar section with} thevalve and com .nections at one end of their movement; Fig. 6 is a plan of the valve-seat on thepowercylinder; Fig.7 showsthegunder side of the cylinder distributing-Jvalve; Fig. 8 shows the under side of the control-valve; and Fig.9 is a diagram showing all the mechanism suitably connected. u 1 t u u The power-cylinder A isplacedintermediate to the reversingbell-crank B and the reversing-lever G, and has its pistonsrod D connected by a jointed tie-bar E ,to one arm of the bell-crank. t

valve G it to easily move the control-valve.

The moving of the ,reversing-leveractw Hates the power-piston by the following.

means. The steam-chest F of the cylinder A is provided with a valve-seat a having steam-ports (Z, (Z, and an exhaust-port connected to an outlet 0'. The main or distrib- 60 uting-valve G has two steam-ports b and an exhaust-port 0, extended through its entire thickness.

The control-valve H is of the ordinary .D-valve type, but has its exhaust-chamber e 5 formed with diamond-shaped ends, as shown in Fig. 8,1zto open the exhaust-connection. gradually.

When the main-valve G is in its central position, as shown in Fig. 4, the ports a d stand over the ports 6, b, but the ports d are sloped in each direction upon the under side so as to maintain connection with the ports I), b in every position of the main- The length of the control valve H is, in practice, one-sixteenth of an inch less than, the length over the ports d, so that in the central. position, shown in Fig. .4, eachfof such ports is open one-thirty-second of an 30 inch, thus permitting the fluid under pres-t sure to operate equally at each side of the piston; D, and thus produce no movement of the piston. u u

The valve-rod H of the controlvalve H 5 is actuated by connection to the reverse-lever C, through a connectingmod C and a control-lever :I, which lever gives a great leverage. to the reversing-lever andthus enables The valverod. G of the main-valve G is operated by a connection to the pistona'od 1) of the powencylinder,through aanain'h valve-lever J l and a bar J connected to the head E. and to the bell-crank B, the lever J 95 reducing tliemovcment so that the movement of the piston D at each side of its, central position, produces amovement of v the mainvalve corresponding to the movements ofthe control valve.

With this construction, if the reversing lever C be moved in either direction the control-valve is shifted and one of the ports (1 is; closedand the other opened. The piston D will thentravel toward the end of the 105 cylinder A, and by its direct connection with the main valve-rod G moves the mainvalve G beneath the control-valve H until the ports (Z are equally covered by the control-valve, and the pressure upon opposite 1 edges of-the piston D then becomes again equalized and its motion stops.

Without any further mechanism, the apparatus is destitute of any look, as no connection exists between the bell-crank B and the reversingdever, and the locking of the reversingdever upon its segment C by means of the latch f exerts no control over the movement of the bell-crank. The present invention, however, provides a connection between the reverse-lever and the bellcrank through the medium of an additional latch 9 upon the reverse-lever, anda hinged sector K having a notch g to engage such latch, and curved seats at opposite sides of the notch to support the latch when the reverse-lever is first moved. The sector is connected by a jointed rod L to the lever J and thus through the bar J to the bellcrank B; The locking of the sector thus locks the bell-crank B. The sector K is jointed upon the fulcrum M of the reversinglever, and the connecting-rod L is jointed to the sector upon a pin N, equi-distant from the fulcrum M with the pin 0 to which the rod C is connected for actuating the control-valve H. 1

The connection of the sector with the re versing-lever is such that when the reverselever is unlatched to move it over the segment C the latch g is simultaneously released from the sector, leaving the reverselever free to move without any efi'ect upon the sector. This is accomplished by making a spring-connection between the latch g and the slide f of the latch f, which is actuated by the ordinary handle it.

The slide f is provided adjacent to the latch g with theslotted cheeks 2', and the latch g is provided with a transverse pin j 'fitted movably to such cheeks, and is pressed normally downward by a spring Zr, so that when the latch engages the notch of the sector K the pin lies in the bottom of the slots, and the lifting of the slide, when the handle it is operated to retract the latch f,

also lifts-the latch g from the sector. The latch is made a trifle shorter than the latch 7, so as'to fully clear the notch 9 before the lever C is released from the segment C When the reverse-lever is moved over its segment C and locked thereon, the latch g is released from the lifting action of the pin j and rests upon the curved surface of the sector K, under the pressure of the spring 70. The movement of the power-piston D, which results from such movement of the reverse-lever, then moves the lever J,

the rod L and the sector K; placing the latter in the same relation to the reverse-lever as before moving, and thus permitting the latch g to lock the sector. The sector thus becomes locked in any position to which the reverse-lever may be moved, and the bellcrank B is thus immovably held by its con nection to the lever J, the rod L and the sector. 1

The levers I and J are so proportioned as to respectively reduce the motion of the control-valve and the main-valve in the same proportion during corresponding movements of the reversing-lever and the piston D, thus securing the coincidence of the notch in the sector with the auxiliary latch, after each movement of the reversing-lever and resulting movement of the piston.

By this mechanism, the bell-crank B may be shifted to either end of its stroke, thus shifting the reverse-link of the locomotive engine-valve so as to reverse the same with full movement; or the bell-crank may be shifted in any intermediate degree, by a lesser movement of the reverse-lever C, as the movement of the power-piston D is arrested when it has moved the main-valve into an equalizing or neutral position below the control-valve. In whatever position the bell-crank B is moved, it is positively locked and immovably held by the engagement of the latch f with the segment C and of the latch g with the sector K.

While the invention is primarily designed operated mechanism in the position to which it may be moved by the agency-of a controlvalve and areverse-lever.

In Fig. 9 of the drawing, the outline of the locomotive boiler is diagrammatically represented by a dotted line P, and the levers I and J are shown mounted upon the boiler by fulcrum-plates Q; but it is immaterial to the operation of the essential elements whether the apparatus be constructed exactly as shown, as fulcra for the levers I and J may be mounted upon a support different from the locomotive boiler, if the apparatusbe used for some different purose. I

Having "thus set forth the nature of the invention what is claimed hereinyis:

' 1. In a poWer-r'eversing' mechanism, the combination, with apower-cylinder, and a piston with rod to transmit the power, of a valve controlling the'supply of fluid under pressure to such cylinder, a reversing-lever connected to such control-valve, and a locking-device comprising an auxiliary latch upon the reverse l ever and a'sector movable with the moving power-device and adapted to engage such latch. v

2. In a power-reversing mechanism, the combination, with a power-cylinder, and a piston with rod to transmit the power, of a distributing-valve applied to the ports of the cylinder and having the ports exvalve applied to the ports upon the dist ributing-va-lve and a reversing-lever connected to such control-valve and having a latch and segment for locking the same, a notched seci tor adjacentto the reverse-lever and movder pressure to such cylinder, and a revers-v i ing-lever connected to such control-valve, and having a notched segment and a mainlatch to engage the same, a notched sector adjacent to the reverse-lever, a connection from the same to the piston-rod, and an auxiliary latch upon the reverse-lever having a spring-connection with the mainlatch and adapted to press elastically upon the sector and engage the notch therein when the sector is moved by the piston-rod.

4. In a power-reversing mechanism, the combination, with a power-cylinder, and a piston with rod to transmit the power, of a valve controlling the supply of fluid under pressure to such cylinder, and a reversing-lever connected to such control-valve and havinga notched segment and a mainlatch to engage the same, a sector hinged upon the reverse-lever fulcrum and having a central notchwith curved seat at each side of the notch and connected to move with the piston-rod, and an auxiliary latch having a spring-connection to the main-latch and adapted to engage the notch in the sector, or to rest upon the curved seats when the reverse-lever is moved independent of the sector.

5. In a power-reversing mechanism, the combination, with a powercylinder, and a piston with red to transmit the power, of a main distributing-valve having a valverod, and a lever connecting the same to the piston and proportionally reducing the valve motion, a control-valve applied to the ports of the main-valve, and having a valve-rod and a reducingdever corresponding to the main valve-lever, a reversing-lever having a pin-and-rod connection to the control-lever, and a notched segment and a main latch to engage the same, a notched sector hinged upon the reverse-lever fulcrum and having a pinandrod connection to the main valve-lever, and anauxiliary latch actuated by the main latch to engage the sector, the proportions of the levers and connections operating to bring the notch of the sector coincident with the auxiliary latch when the piston is moved after each actuation of the reverse-lever. y

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

CHARLES L. DUNBAR. Witnesses:

SARAH LAWTON,

WILLIAM G. LEWIS.

Copies of this patent maybe obtained for five cents each, by addressing the Commissioner of Iatents.

Washington, D. C. 

